s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 104
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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ARM INSTRUCTION SET
MULTIPLY AND MULTIPLY-ACCUMULATE (MUL, MLA)
The instruction is only executed if the condition is true. The various conditions are defined in Table 3-2. The
instruction encoding is shown in Figure 3-12.
The multiply and multiply-accumulate instructions use an 8-bit Booth's algorithm to perform integer multiplication.
The multiply form of the instruction gives Rd:=Rm*Rs. Rn is ignored, and should be set to zero for compatibility with
possible future upgrades to the instruction set. The multiply-accumulate form gives Rd:=Rm*Rs+Rn, which can save
an explicit ADD instruction in some circumstances. Both forms of the instruction work on operands which may be
considered as signed (2's complement) or unsigned integers.
The results of a signed multiply and of an unsigned multiply of 32-bit operands differ only in the upper 32 bits - the
low 32 bits of the signed and unsigned results are identical. As these instructions only produce the low 32 bits of a
multiply, they can be used for both signed and unsigned multiplies.
For example consider the multiplication of the operands:
Operand A
0xFFFFFFF6
3-22
31
Cond
Operand B
0x0000001
28
27
0
0
0 0 0 0
Result
0xFFFFFF38
22
21 20
A
Figure 3-12. Multiply Instructions
[15:12][11:8][3:0] Operand Registers
[19:16] Destination Register
[20] Set Condition Code
0 = Do not after condition codes
1 = Set condition codes
[21] Accumulate
0 = Multiply only
1 = Multiply and accumulate
[31:28] Condition Field
S
19
Rd
16
15
Rn
12
11
Rs
8 7
1 0 0 1
4 3
Rm
0
S3C2410A
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